@donmcm It should work as soon as the meter has been installed, but SP have a lot of technology problems and so it could be several days or weeks. If you look at the help pages for smart PAYG meters there are several ways of paying if the app does not work.
Scottish Power cannot run a website properly so how you expect to run smart meters is just a joke .
Customer service is non existent you are directed to a live chat link which is hidden of course ,
If you can find the live chat link you will be directed to Gabriel Gnomes in a Mumbai call centre !
Forget about a smart meter with SP the in-house display does not work after 2 weeks if you call there help line after 2 hours you might be answered by somebody who has been sleeping on their desk and you are just a nuisance . After telling you to disconnect meter for 48 hours and dance round a full moon naked it should work . I am 63 and expected me to enter UTRN number s of 20 numbers on ground level meters you are having a